Strange Problems With My Roadster

I picked up a used Roadster head. However, I noticed some strange problems with it.

1) When switching from Channel 2's Brit mode to Channel 1, there is a brief yet noticeable popping/humming noise. This does not occur when switching to other channels or when Brit mode is not selected.

2) Turning up the reverb causes a noticeable hum in Channel 1. This does not occur in any other channel.

The amp still has a few months of warranty left. Should I take it to a tech?

It's normal. There have been hundreds of threads on this subject.

It's safe to say I've read most of those threads before I posted mine. The "popping" noise everyone refers to happens when they switch between all the channels. Mine only happens when switching from the Brit mode to any mode in Channel 1. Cycling through the channels in standby does nothing to fix the problem.

The only thread I've found about my reverb issue is the following one.

http://forum.grailtone.com/viewtopic.php?f=24&t=33448&hilit=reverb+roadster

Changing the preamp tube doesn't help. Why would a bad reverb tube only effect one channel?